To ensure the safe storage of wheat seeds, it is necessary to grasp the three characteristics of wheat seeds: post-maturation, heat resistance and hygroscopicity. After ripening wheat seeds have a long post-harvest period after harvest, generally 30-40 days for spring wheat, 60-70 days for half winter wheat, and 80 days for winter wheat. In this physiological ripening stage, the body of the seed continues to have a synthetic process: non-protein nitrogen protein synthesis, fatty acids and glycerol synthesis of fat, soluble sugar synthesis of starch, water reduction, enzyme activity gradually decreased. In this process, the seed respiration is very vigorous, and the result of metabolism releases water and carbon dioxide, causing the seed surface to wet. Therefore, wheat seeds that have not completed ripening have poor storage stability and measures must be taken to accelerate the completion of the ripening phase. Dry air, sufficient oxygen and sun exposure all help the seeds mature. Therefore, the sun-seed method can be used to promote the completion of wheat ripening. In general, the germination rate reached 80% to complete the standard of ripening. Wheat seeds with no heat-resistance after completion of ripening have higher heat resistance. Wheat seeds with moisture content above 16% will not lose seed if they are dried within 50°C for a short time. Germination rate. The hot storage of wheat seeds is based on this principle. However, the wheat seeds that have been physiologically ripened have a significant reduction in heat resistance. If treated with high temperatures, the seed germination rate will be affected. Therefore, for the wheat seeds that have been completed with physiological after-ripening and high water content, it is preferable to use the sun drying method, but not with the high temperature drying method, and it is even more unfavorable to use the seed hot storage. Hygroscopic wheat seeds have strong hygroscopicity, high moisture absorption rate, and are easy to absorb water vapor in the air, especially when the air temperature is high, the water content of seeds will increase. The hygroscopicity of wheat seeds varies depending on the variety. White-skin wheat is more hygroscopic than red-skin wheat, and weak-grain wheat is larger than durum wheat. In addition, the hygroscopicity of small grains, damaged grains, and worm grains is greater than that of large and intact grains. Therefore, for wheat varieties with a safe moisture content of more than 12%, it is necessary to enter the warehouse in time and adopt a closed storage method. If it is a full warehouse, it should be within the allowable range, try to increase the bulk height, sealed storage; if it is packed, it is appropriate to use flat piles stacked. When storing a small amount of wheat seeds, special attention should be paid to the damage of the wheat moth. China Agricultural Network Editor